US2023113268A1PendingUtilityA1
Light emitting diode temperature estimation
Est. expiryOct 12, 2041(~15.2 yrs left)· nominal 20-yr term from priority
Inventors:Linden A. ReustleShao-Nung LiangJulia TaussigJacob D. DoveChristopher J. MeehanDavid M. Vanderiet
A61B 5/72A61B 2562/02A61B 5/145G16H 40/40G16H 40/63A61B 5/14552A61B 2560/0223A61B 5/1495A61B 2562/0271A61B 5/14551A61B 2560/0252
65
PatentIndex Score
0
Cited by
0
References
0
Claims
Abstract
A method includes determining a difference in voltage value for a light emitting diode based on a first voltage at the light emitting diode for a first current and a second voltage at the light emitting diode for a second current and determining a temperature for the light emitting diode based on the difference in voltage value. The method further includes outputting an indication of the temperature.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A device comprising circuitry configured to:
determine a difference in voltage value for a light emitting diode based on a first voltage at the light emitting diode for a first current and a second voltage at the light emitting diode for a second current; determine a temperature for the light emitting diode based on the difference in voltage value; and output an indication of the temperature.
2 . The device of claim 1 , wherein, to determine the difference in voltage value, the circuitry is configured to:
multiply the second voltage by a result of dividing the first current by the second current to generate a modified second voltage; and subtract the modified second voltage from the first voltage.
3 . The device of claim 1 , wherein, to determine the difference in voltage value, the circuitry is configured to calculate:
Δ
V
=
V
(
T
,
I
1
)
-
I
1
2
V
(
T
,
I
2
)
where V(T, I 1 ) is the first voltage for a temperature ‘T’ at the first current (I 1 ), V(T, I 2 ) is the second voltage for the temperature ‘T’ at the second current ( 12 ), and ΔV is the difference in voltage value for the light emitting diode.
4 . The device of claim 1 , wherein, to determine the temperature, the circuitry is configured to determine the temperature for the light emitting diode based on the difference in voltage value and based further on calibration information.
5 . The device of claim 1 , wherein, to determine the temperature, the circuitry is configured to determine the temperature for the light emitting diode based on the difference in voltage value and based further on a calibration temperature of the light emitting diode during a calibration process for the light emitting diode.
6 . The device of claim 1 , wherein, to determine the temperature, the circuitry is configured to determine the temperature for the light emitting diode based on the difference in voltage value and based further on a calibration difference in voltage value for the light emitting diode measured during a calibration process.
7 . The device of claim 1 , wherein, to determine the temperature, the circuitry is configured to:
determine a slope factor, a calibration temperature of the light emitting diode during a calibration process for the light emitting diode, and a calibration difference in voltage value for the light emitting diode measured during the calibration process; subtract the calibration difference in voltage value for the light emitting diode from the difference in voltage value for the light emitting diode; multiply the slope factor to a result of the subtraction to generate a temperature difference value; and add the calibration temperature to the temperature difference value.
8 . The device of claim 1 , wherein, to determine the temperature, the circuitry is configured to calculate:
T
F
=
T
M
+
Δ
T
Δ
Δ
V
(
Δ
V
F
-
Δ
V
M
)
where T F is the temperature of the light emitting diode, T M is a calibration temperature during a manufacturing calibration process,
Δ
T
Δ
Δ
V
is a slope factor, ΔV F is the difference in voltage value for the light emitting diode, and ΔV M is a difference in voltage value for the light emitting diode during the manufacturing calibration process.
9 . The device of claim 1 , wherein the circuitry is configured to:
determine whether the light emitting diode is valid to use for temperature estimation based on the temperature for the light emitting diode; in response to the determination that the light emitting diode is valid, determine an oxygen saturation level using the light emitting diode; and output an indication of the oxygen saturation level.
10 . The device of claim 9 , wherein the light emitting diode comprises a first light emitting diode and wherein the circuitry is further configured to:
determine a second difference in voltage value for a second light emitting diode based on a first voltage at the second light emitting diode for a first current at the second light emitting diode and a second voltage at the second light emitting diode for a second current at the second light emitting diode; and determine a temperature for the second light emitting diode based on the second difference in voltage value for the second light emitting diode, wherein the determination that the first light emitting diode is valid is further based on the temperature for the second light emitting diode.
11 . The device of claim 1 , wherein the circuitry is further configured to:
determine an intensity of a received photonic signal corresponding to an output photonic signal output using the light emitting diode; determine an oxygen saturation level based on the intensity of the received photonic signal and the temperature for the light emitting diode; and output an indication of the oxygen saturation level.
12 . The device of claim 11 , wherein the circuitry is configured to estimate a wavelength for the output photonic signal based on the temperature at the light emitting diode, wherein to determine the oxygen saturation level, the circuitry is configured to determine the oxygen saturation level based on an intensity of the received photonic signal corresponding to an output photonic signal output using the light emitting diode and further based on the estimated wavelength for the output photonic signal.
13 . The device of claim 11 , wherein the circuitry is configured to:
drive the light emitting diode to output the output photonic signal towards a subject's tissue; and receive, from a detector, the received photonic signal after the output photonic signal transmits through the subject's tissue.
14 . The device of claim 11 , wherein the determination of the difference in voltage value and the determination of the temperature is for a first instance and wherein the circuitry is configured to:
determine, for a second instance different from the first instance, the difference in voltage value for the light emitting diode based on the first voltage at the light emitting diode for the first current and the second voltage at the light emitting diode for the second current; determine, for the second instance, the temperature for the light emitting diode based on the difference in voltage value for the second instance; determine whether the temperature for the second instance satisfies an operational threshold; and output an indication that the temperature for the second instance is not within operation limits for the determination of the oxygen saturation level for the second instance in response to the determination that the temperature for the second instance does not satisfy the operational threshold.
15 . The device of claim 1 , wherein the circuitry is configured to:
determine whether the temperature satisfies a safety threshold; and output an indication that the temperature is not safe in response to the determination that the temperature does not satisfy the safety threshold.
16 . The device of claim 1 , wherein the circuitry is configured to:
determine whether the temperature satisfies an expected healthy threshold; and output an indication that the temperature indicates a potential health concern in response to the determination that the temperature does not satisfy the expected healthy threshold.
17 . The device of claim 16 , wherein, to output the indication that the temperature indicates the potential health concern, the circuitry is configured to output the indication that the temperature indicates the potential health concern to a clinician device.
18 . The device of claim 1 , wherein the device does not include a temperature sensor.
19 . A method comprising:
determining a difference in voltage value for a light emitting diode based on a first voltage at the light emitting diode for a first current and a second voltage at the light emitting diode for a second current; determining a temperature for the light emitting diode based on the difference in voltage value; and outputting an indication of the temperature.
20 . A system comprising:
a sensor device comprising a light emitting diode; and a device comprising circuitry configured to:
determine a difference in voltage value for the light emitting diode based on a first voltage at the light emitting diode for a first current and a second voltage at the light emitting diode for a second current;
determine a temperature for the light emitting diode based on the difference in voltage value; and
output an indication of the temperature.Join the waitlist — get patent alerts
Track US2023113268A1 — get alerts on status changes and closely related new filings.
We store only your email — no account needed. See our privacy policy.